April 6 project update: Disassembly continues
Posted on Apr 6 2015 8:58 AM
It’s been a busy week since Seattle Tunnel Partners lifted the SR 99 tunneling machine’s front end to the surface for repairs. Crews spent the first few days after the lift cleaning and disconnecting parts. Then, on Friday afternoon, they removed the machine’s bearing block and set it on a platform south of the cutterhead.
Further disassembly will continue in the coming days, including removal of the main bearing. When the disassembly phase of STP’s repair effort is complete, manufacturer Hitachi Zosen will begin making repairs and enhancements (links to YouTube). You can continue to track STP’s work on our time-lapse cameras and follow @BerthaDigsSR99 on Twitter for updates. Don't forget to check out the other resources we've created to give you a fuller understanding of Bertha's story:
- Three-angle time-lapse video of Bertha's front end lift (links to YouTube)
- Single-angle time-lapse video of Bertha's front end lift (links to YouTube)
- Time-lapse video of Bertha's first piece rising to the surface (links to YouTube)
- Time-lapse video of Bertha parking in the pit (links to YouTube)
- Video of Bertha's breakthrough (links to YouTube)
- Video of crews chipping a Bertha-sized circle on the face of the pit’s southern wall (links to YouTube).
- Narrated video explaining STP's repair plan (links to YouTube)
- Seattle Tunnel Partners repair work plan (pdf 4.8 Mb)